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#!/bin/bash
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response=`/usr/sbin/i2cget -y 1 0x18 0x05 w`
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upper_byte=$(($response & 0x00FF))
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lower_byte=$(($response & 0xFF00))
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let "sign=0"
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# test the sign
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if [ $(($upper_byte & 0x10)) = 0x10 ]
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then
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upper_byte=$(($upper_byte & 0x0F))
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let "temperature = 256 - (upper_byte * 16 + lower_byte / 4096)"
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else
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upper_byte=$((upper_byte & 0x0F))
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let "temperature = ($upper_byte*100 * 16 + $lower_byte*100 / 4096)"
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fi
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printf %.2f "$(($temperature))e-2"
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